China International Trust and Investment Corp's (Citic Guoan) advertising arm will scrap its joint venture with UK-based global marketing services group WPP and team up with rival Omnicom following an alleged snub by chief executive Sir Martin Sorrell, the Financial Times reported. Yan Gang, vice-chairman of Citic Guoan and head of Beijing Guoan Advertising Corp, alleged Sir Martin had treated him badly at an April meeting in London to address management problems at the 14-year-old joint venture, which WPP acquired along with Grey Advertising last year. "I have met a lot of people but never met anyone as rude as [Sir] Martin," Yan said. Beijing Guoan is one of China's 10 largest domestic advertising agencies. WPP is expanding its presence rapidly in China, where revenues reached nearly US$500 million this year, but the joint venture is a very small part of its business.